Hearthpwn

Unfortunately you are right, but if card is too strong in format like that it speaks something about it's power and they do sometimes nerf cards for wild only.

Well I can't say much for standard since I am wild player, but in wild you use your cheap minions like Novice to draw your combo and with just 1 mana you can use your useless board to clear huge boards, or if you are playing Cubelock it can be both clear and trigger for cards that you want to die. And if you think that the conditions are hard to meet just consider how many good cheap minions for warlock there is, Expired Merchant, Kobold Librarian, Mistress of Mixture and those are only 1 mana which you even don't need on board, plus against for example highlander decks it's really important that your Albatros dies in the same turn he was played because they can silence it or polymorph it. And again speaking for wild, only Psychic Scream can be on the same level of power as Plague and maybe Defile, but Brawl and Mass Hysteria are definately not it's level and you can ask almost every wild player and I believe they will tell you the same and I guess that you are not a wild player?

I also agree that Plague of Flames needs a nerf. In wild where there are so many board clears it's still one of the best (if not the best). And it's really easy to nerf it and still be pretty good, 2 mana, but I think maybe even 3 mana would still be good enough.